Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 23,222	$ 24,614
Accounts receivable	16,068	4,489
Prepaid and other current assets	940	267
Total current assets	40,230	29,370
Other assets
Property and equipment - net of accumulated depreciation	274	0
Right of use assets - operating leases	849
Patents and patent applications - net of accumulated amortization	15	16
Total assets	41,368	29,386
Current liabilities
Accounts payable and accrued expenses	1,952	1,133
License fees	0	5,400
Accrued salaries and wages	1,129	1,084
Royalty payable	4,475	998
Deferred revenue	1,355	1,212
Operating leases - current	493
Total current liabilities	9,404	9,827
Long-term liabilities
Operating leases - long term	358
License fees	0	2,700
Total long-term liabilities	358	2,700
Total liabilities	9,762	12,527
Stockholders' equity
Common stock; par value $0.001; 200,000,000 shares authorized; 4,074,622 and 3,845,361 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	4	4
Additional paid-in capital	95,497	91,276
Accumulated deficit	(63,895)	(74,421)
Total stockholders' equity	31,606	16,859
Total liabilities and stockholders' equity	$ 41,368	$ 29,386